A002691 - OEIS

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A002691 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`9`
`2`		`120`
`3`		`2100`
`4`		`45360`
`5`		`1164240`
`6`		`34594560`
`7`		`1167566400`
`8`		`44108064000`
`9`		`1843717075200`
`10`		`84475764172800`
`11`		`4209708914611200`
`12`		`226676633863680000`
`13`		`13114862387827200000`
`14`		`811372819726909440000`
`15`		`53449184499510159360000`
`16`		`3735154775612827607040000`

[1,9,120,2100,45360,1164240,34594560,1167566400, 44108064000,1843717075200,84475764172800, 4209708914611200,226676633863680000, 13114862387827200000,811372819726909440000, 53449184499510159360000,3735154775612827607040000]

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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)